25787121 has 8 divisors (see below), whose sum is σ = 34414464. Its totient is φ = 17175600.

The previous prime is 25787081. The next prime is 25787171. The reversal of 25787121 is 12178752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25787121 - 2⁷ = 25786993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25787171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (4301808).

Almost surely, 2^25787121 is an apocalyptic number.

It is an amenable number.

25787121 is a deficient number, since it is larger than the sum of its proper divisors (8627343).

25787121 is a wasteful number, since it uses less digits than its factorization.

25787121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911.

The product of its digits is 7840, while the sum is 33.

The square root of 25787121 is about 5078.1021061022. The cubic root of 25787121 is about 295.4388603500.

It can be divided in two parts, 257 and 87121, that added together give a palindrome (87378).

The spelling of 25787121 in words is "twenty-five million, seven hundred eighty-seven thousand, one hundred twenty-one".